(Modernized) patch from egavilan to fix [2863003fff] and [d6b95ce492] - tk frame does not shrink to 0 height if last children unpacked. A virtual event is sent when the pack or grid geometry manager leaves a parent without any slavesd6b95ce492

1 files changed, 5 insertions, 1 deletions

diff --git a/generic/tkPack.c b/generic/tkPack.c
index 88a4b2d..d46d64c 100644
--- a/generic/tkPack.c
+++ b/generic/tkPack.c
@@ -600,10 +600,14 @@ ArrangePacking(
 
     /*
      * If the master has no slaves anymore, then don't do anything at all:
-     * just leave the master's size as-is.
+     * just leave the master's size as-is, but signal the master with the
+     * <<GeometryManager>> virtual event.
+     * Otherwise there is no way to "relinquish" control over the master
+     * so another geometry manager can take over.
      */
 
     if (masterPtr->slavePtr == NULL) {
+        TkSendVirtualEvent(masterPtr->tkwin, "GeometryManager", NULL);
 	return;
     }