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Okay,
In the clipboard history code of Sigil, anytime the clipboard changes, a changed() signal is sent. So as you highlight code in X11 it is constantly sending this signal where the current contents of the clipboard are compared against the highlighted text so far and added to the clipboard if and only if there is something in the system clipboard.
There is a screen to filter these signals out by mode (data or selection) but it appears to fail for x11. This only happen for X11 because it has a selection mode. On other systems you must hit copy not simply highlight something to activate the clipboard. I will see if the datachanged signal with proper filter would work better on Linux. The docs on changed(mode) signal are obviously incorrect for Linux or Qt has a bug since the mode check on the changed() signal in Sigil should be preventing this but obviously is not.
I will post something to try and fix this tomorrow for linux users to try. I'm off to sleep now.
KevinH
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