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The idea is related to KWin and how it handles close button. My idea is about showing close application dialog by double-click on window close button. Actually there's delay to wait for application response.

Sorry, but I simply don't understand what this is about. Maybe you could add some more explanation about what you suggest?

I don't see any delay as mentioned and what do you refer to with "close application dialog"?

Probably relating to when a window is unresponsive and hitting the close button doesn't provide immediate feedback.
Normally if you click the close button on an unresponsive window, if the window doesn't close itself after a certain amount of time kwin will pop up a dialog asking if you want to force-close the window.
This idea could be a way to expedite the forceful closing of the window by allowing you to double-click the close button to bring up that dialog.

airdrik wrote:Probably relating to when a window is unresponsive and hitting the close button doesn't provide immediate feedback.
Normally if you click the close button on an unresponsive window, if the window doesn't close itself after a certain amount of time kwin will pop up a dialog asking if you want to force-close the window.
This idea could be a way to expedite the forceful closing of the window by allowing you to double-click the close button to bring up that dialog.

You have right. My idea is exactly explained by your description.