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Maintain different buffer flags, stack limit, tests

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This commit is contained in:
Daniel Imms
2026-01-09 11:59:50 -08:00
parent 5a29d489c3
commit c624a47780
5 changed files with 122 additions and 48 deletions
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src/common/InputHandler.ts
+17
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@@ -2009,6 +2009,12 @@ export class InputHandler extends Disposable implements IInputHandler {
// FALL-THROUGH
case 47: // alt screen buffer
case 1047: // alt screen buffer
// Swap kitty keyboard flags: save main, restore alt
if (this._optionsService.rawOptions.vtExtensions?.kittyKeyboard) {
const state = this._coreService.kittyKeyboard;
state.mainFlags = state.flags;
state.flags = state.altFlags;
}
this._bufferService.buffers.activateAltBuffer(this._eraseAttrData());
this._coreService.isCursorInitialized = true;
this._onRequestRefreshRows.fire(undefined);
@@ -2238,6 +2244,12 @@ export class InputHandler extends Disposable implements IInputHandler {
// FALL-THROUGH
case 47: // normal screen buffer
case 1047: // normal screen buffer - clearing it first
// Swap kitty keyboard flags: save alt, restore main
if (this._optionsService.rawOptions.vtExtensions?.kittyKeyboard) {
const state = this._coreService.kittyKeyboard;
state.altFlags = state.flags;
state.flags = state.mainFlags;
}
// Ensure the selection manager has the correct buffer
this._bufferService.buffers.activateNormalBuffer();
if (params.params[i] === 1049) {
@@ -3043,6 +3055,11 @@ export class InputHandler extends Disposable implements IInputHandler {
const isAlt = this._bufferService.buffer === this._bufferService.buffers.alt;
const stack = isAlt ? state.altStack : state.mainStack;
// Evict oldest entry if stack is full (DoS protection, limit of 16)
if (stack.length >= 16) {
stack.shift();
}
// Push current flags onto stack and set new flags
stack.push(state.flags);
state.flags = flags;