[1.14] Use the viewport-rel. cursor pos for CursorPosition #13786
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In #13024, we removed `Terminal::GetCursorPosition` from TerminalCore. This has been widely regarded as a good move. Now, you might rightly be wondering: why didn't compilation immediately fail? Well. It turns out that there were _two_ copies of `GetCursorPosition`. One for `const Terminal`, and one for `Terminal`. This is important. `Terminal::GetCursorPosition()` returned the cursor position relative to the viewport. `Terminal::GetCursorPosition() const`, however, returns the cursor position in absolute. We removed the non-`const` one. Fortunately, thanks to the lookup rules for `const`-qualified members, this didn't matter. Code that called `GetCursorPosition()` still called `GetCursorPosition()`, and everything was fine. Except that part about the relative coordinates. That was not fine. The TSF control is the _only_ consumer of `ControlCore.CursorPosition`, and that was the _only_ consumer of relative-`GetCursorPosition()`. This commit restores equilibrium by introducing a new `GetViewportRelativeCursorPosition()` member to `Terminal` and switching over the only consumer of relative cursor position to use it. Closes #13769.
ghost
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Area-Input
carlos-zamora
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Aug 19, 2022
zadjii-msft
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Aug 22, 2022
DHowett
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In #13024, we removed
Terminal::GetCursorPositionfrom TerminalCore.This has been widely regarded as a good move.
Now, you might rightly be wondering: why didn't compilation immediately
fail? Well. It turns out that there were two copies of
GetCursorPosition. One forconst Terminal, and one forTerminal.This is important.
Terminal::GetCursorPosition()returned the cursor position relative tothe viewport.
Terminal::GetCursorPosition() const, however, returnsthe cursor position in absolute.
We removed the non-
constone. Fortunately, thanks to the lookup rulesfor
const-qualified members, this didn't matter. Code that calledGetCursorPosition()still calledGetCursorPosition(), and everythingwas fine.
Except that part about the relative coordinates. That was not fine.
The TSF control is the only consumer of
ControlCore.CursorPosition,and that was the only consumer of relative-
GetCursorPosition().This commit restores equilibrium by introducing a new
GetViewportRelativeCursorPosition()member toTerminaland switchingover the only consumer of relative cursor position to use it.
Closes #13769.
Backport of #13785.