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Show Configure KDevelop... dialog faster

Igor Kushnir requested to merge igorkushnir/kdevelop:show-configure-kdevelop-faster into master

There is an annoying 2-second delay before KDevelop settings dialog appears. This commit reduces the delay to about 1 second.

I have measured the time spent in UiController::showSettingsDialog() - from the beginning of the function until the last blocking statement cfgDlg.exec() - with QElapsedTimer. This time is 300-400 ms longer when the Configure KDevelop... dialog is first shown after KDevelop starts. The following table compares these average times in milliseconds before and at this commit:

                    before  at
first shown         2070    930
non-first shown     1750    580

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