This is a modified version of Andy Oliver's patch for Alt-Tab window.

Original description:

> This patch changes the Alt-Tab popup window to show all window icons
> while switching, not just the current one.  The icon for the current
> window is highlighted with a rectangle.
>
> Andy Oliver
> aoliver@earthlink.net
> http://home.earthlink.net/~aoliver

Marius Gedminas
marius@gedmin.as
http://gedmin.as/icewm/

diff -u ./src/wmswitch.cc.orig ./src/wmswitch.cc
--- ./src/wmswitch.cc.orig	Mon Nov  8 13:45:52 1999
+++ ./src/wmswitch.cc	Sat Jun 24 22:40:11 2000
@@ -18,6 +18,8 @@
 
 #include <string.h>
 
+#define ICON_SIZE 32
+
 YColor *SwitchWindow::switchFg = 0;
 YColor *SwitchWindow::switchBg = 0;
 
@@ -38,10 +40,9 @@
     modsDown = 0;
     isUp = false;
 
-    int sW = 4 + manager->width() / 5 * 3;
-    int sH = 4 + 32;
-        //statusFont->max_bounds.ascent +
-        //statusFont->max_bounds.descent;
+    int sW = ICON_SIZE + 14;
+    // Leave enough space for border, icons, selection rectangle, and name
+    int sH = 18 + ICON_SIZE + switchFont->height();
 
     setGeometry(manager->width() / 2 - sW / 2, manager->height() / 2 - sH / 2,
                 sW, sH);
@@ -56,7 +57,51 @@
     }
 }
 
+int SwitchWindow::iconWidth() {
+    int width = 0;
+
+    YFrameWindow *fFirstWindow = nextWindow(0, true, false);
+    YFrameWindow *fCurrentWindow = fFirstWindow;
+    do {
+        // If there is an icon for this window
+        if (fCurrentWindow->clientIcon() && fCurrentWindow->clientIcon()->large()) {
+            width += fCurrentWindow->clientIcon()->large()->width() + 3;
+        }
+
+        // Advance to next icon
+        fCurrentWindow = nextWindow(fCurrentWindow, true, true);
+    } while (fCurrentWindow != fFirstWindow);
+
+    if (width > 3)
+        width -= 3;
+
+    return width;
+}
+
+void SwitchWindow::resize()
+{
+    int sW = iconWidth() + 14;
+    if (sW < ICON_SIZE + 14)
+        sW = ICON_SIZE + 14;
+    if (fActiveWindow) {
+        const char *str = fActiveWindow->client()->windowTitle();
+        if (str) {
+            int w = switchFont->textWidth(str) + 14;
+            if (sW < w)
+                sW = w;
+        }
+    }
+    if ((unsigned)sW > manager->width())
+        sW = manager->width();
+    int sH = 18 + ICON_SIZE + switchFont->height();
+    setGeometry(manager->width() / 2 - sW / 2, manager->height() / 2 - sH / 2,
+                sW, sH);
+}
+
 void SwitchWindow::paint(Graphics &g, int /*x*/, int /*y*/, unsigned int /*width*/, unsigned int /*height*/) {
+
+    resize();
+
     g.setColor(switchBg);
     g.drawBorderW(0, 0, width() - 1, height() - 1, true);
     if (switchbackPixmap)
@@ -65,22 +110,52 @@
         g.fillRect(1, 1, width() - 3, height() - 3);
 
     if (fActiveWindow) {
-        int ofs = 0, pos;
-        if (fActiveWindow->clientIcon() && fActiveWindow->clientIcon()->large()) {
-            g.drawPixmap(fActiveWindow->clientIcon()->large(), 2, 2);
-            ofs = fActiveWindow->clientIcon()->large()->width() + 2;
-        }
+        int ofs;
+        int ICON_SEP = 3;
         g.setColor(switchFg);
+
+        // Draw all the icons
+        ofs = width() / 2 - iconWidth() / 2;
+        if (ofs < 0)
+            ofs = 0;
+        YFrameWindow *fFirstWindow = nextWindow(0, true, false);
+        YFrameWindow *fCurrentWindow = fFirstWindow;
+        do {
+            // If there is an icon for this window
+            if (fCurrentWindow->clientIcon() && fCurrentWindow->clientIcon()->large()) {
+                // Draw Current Icon
+                g.drawPixmap(fCurrentWindow->clientIcon()->large(), ofs, 7);
+
+                // If the current window is the active window
+                if (fCurrentWindow == fActiveWindow) {
+                    // Determine border corners
+                    int ulx = ofs - 2;
+                    int uly = 5;
+                    int lrx = ulx + fCurrentWindow->clientIcon()->large()->width() + 3;
+                    int lry = uly + fCurrentWindow->clientIcon()->large()->height() + 3;
+
+                    // Draw Border
+                    g.drawLine(ulx, uly, lrx, uly);
+                    g.drawLine(lrx, uly, lrx, lry);
+                    g.drawLine(lrx, lry, ulx, lry);
+                    g.drawLine(ulx, lry, ulx, uly);
+                }
+
+                // Specify X offset for next icon
+                ofs += fCurrentWindow->clientIcon()->large()->width() + ICON_SEP;
+            }
+
+            // Advance to next icon
+            fCurrentWindow = nextWindow(fCurrentWindow, true, true);
+        } while (fCurrentWindow != fFirstWindow);
+
+        // Display the currently selected window's name below icons
         g.setFont(switchFont);
         const char *str = fActiveWindow->client()->windowTitle();
         if (str) {
-            pos = ofs + (width() - ofs) / 2 - switchFont->textWidth(str) / 2;
-            if (pos < ofs)
-                pos = ofs;
-            g.drawChars(str, 0, strlen(str),
-                        pos,
-                        height() / 2 + (switchFont->height()) / 2
-                        - switchFont->descent());
+            int x = width() / 2 - switchFont->textWidth(str) / 2;
+            int y = ICON_SIZE + 13 + switchFont->ascent();
+            g.drawChars(str, 0, strlen(str), x, y);
         }
     }
 }

diff -u ./src/wmswitch.h.orig ./src/wmswitch.h
--- ./src/wmswitch.h.orig	Mon Nov  8 13:45:52 1999
+++ ./src/wmswitch.h	Sat Jun 24 22:31:57 2000
@@ -12,12 +12,14 @@
 
     virtual void paint(Graphics &g, int x, int y, unsigned int width, unsigned int height);
 
+    int iconWidth();
+    void resize();
     YFrameWindow *nextWindow(YFrameWindow *from, bool zdown, bool next);
     void begin(bool zdown, int mods);
 
     virtual void activatePopup();
     virtual void deactivatePopup();
-    
+
     virtual bool handleKey(const XKeyEvent &key);
     virtual void handleButton(const XButtonEvent &button);