After assigning CTRL-H as a keystroke to show the replace dialog. The replace dialog is also shown when the backspace is pressed.
My guess is that CTRL-H and Backspace have the same ASCII code. This is confirmed by Assigning CTRL-M to show the replace Dialog, since it has the same ASCII code as ENTER, the replace dialog is shown every time ones presses enter.
PellesC IDE 6.50, 64 bit.