Could this have something to do with Sebastian Sauer's optimizations in the
progress bar code?

I doubt it, because 1) I haven't updated my copy to sebastian's optimization 2)
I pretty sure it has happen before, but it was at the beginning of me playing
with a tablet, so I wasn't too sure what exactly went wrong

Pity... Now it looks like we will need Adrian for this bug.

SVN commit 599731 by berger:

fix the fill tool going made when use with the tablet in 1.6, don't close the bug as we might want a better solution for 2.0

CCBUG:133148


 M  +4 -1      kis_tool_fill.cc  
 M  +1 -0      kis_tool_fill.h  


--- branches/koffice/1.6/koffice/krita/plugins/tools/defaulttools/kis_tool_fill.cc #599730:599731
@@ -50,7 +50,7 @@
 #include "kis_selection.h"
 
 KisToolFill::KisToolFill()
-    : super(i18n("Fill"))
+    : super(i18n("Fill")), m_wasPressed(false)
 {
     setName("tool_fill");
     m_subject = 0;
@@ -138,10 +138,13 @@
 void KisToolFill::buttonPress(KisButtonPressEvent *e)
 {
     m_startPos = e->pos();
+    m_wasPressed = true;
 }
 
 void KisToolFill::buttonRelease(KisButtonReleaseEvent *e)
 {
+    if(!m_wasPressed) return;
+    m_wasPressed = false;
     if (!m_subject) return;
     if (!m_currentImage || !m_currentImage->activeDevice()) return;
     if (e->button() != QMouseEvent::LeftButton) return;
--- branches/koffice/1.6/koffice/krita/plugins/tools/defaulttools/kis_tool_fill.h #599730:599731
@@ -79,6 +79,7 @@
     QCheckBox *m_checkUsePattern;
     QCheckBox *m_checkSampleMerged;
     QCheckBox *m_checkFillSelection;
+    bool m_wasPressed; // use for preventing bug:133148
 };
 
 

Better close the bug: the 2.0 situation is already so very different that this
bug isn't relevant for that code anymore.