InputText: Fixed a tricky edge case, ensuring value is always written back on the frame where IsItemDeactivated() returns true (#4714)

Altered ItemAdd() clipping rule to keep previous-frame ActiveId unclipped to support that late commit.

Also, MarkItemEdited() may in theory need to do:
if (g.ActiveIdPreviousFrame == id)
        g.ActiveIdPreviousFrameHasBeenEditedBefore = true;
But this should already be set so not adding now.

imgui.h

@@ -23,7 +23,7 @@
 // Library Version
 // (Integer encoded as XYYZZ for use in #if preprocessor conditionals, e.g. '#if IMGUI_VERSION_NUM > 12345')
 #define IMGUI_VERSION               "1.89.5 WIP"
-#define IMGUI_VERSION_NUM           18941
+#define IMGUI_VERSION_NUM           18942
 #define IMGUI_HAS_TABLE
 
 /*