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Fixed: Make ScrollDown escape respect margins

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SD sequence (`${CSI}${N}T`) was scrolling the whole width
 of the terminal instead of just between the margins.
RI sequence (`${ESC}M`, move cursor up 1 line) was doing the same.
Fixed that.

Fixes #2576 where in tmux scrolling one of several
 side-by-side panels down resulted in all visually scrolling.
This commit is contained in:
Evgeny Zhabotinsky
2022-09-25 05:25:14 +03:00
committed by Fredrik Fornwall
parent 245158ceb9
commit d90e3fbca1
2 changed files with 14 additions and 4 deletions
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8
terminal-emulator/src/main/java/com/termux/terminal/TerminalEmulator.java
View File

@@ -1418,8 +1418,8 @@ public final class TerminalEmulator {
// http://www.vt100.net/docs/vt100-ug/chapter3.html: "Move the active position to the same horizontal
// position on the preceding line. If the active position is at the top margin, a scroll down is performed".
if (mCursorRow <= mTopMargin) {
mScreen.blockCopy(0, mTopMargin, mColumns, mBottomMargin - (mTopMargin + 1), 0, mTopMargin + 1);
blockClear(0, mTopMargin, mColumns);
mScreen.blockCopy(mLeftMargin, mTopMargin, mRightMargin - mLeftMargin, mBottomMargin - (mTopMargin + 1), mLeftMargin, mTopMargin + 1);
blockClear(mLeftMargin, mTopMargin, mRightMargin - mLeftMargin);
} else {
mCursorRow--;
}
@@ -1628,8 +1628,8 @@ public final class TerminalEmulator {
final int linesToScrollArg = getArg0(1);
final int linesBetweenTopAndBottomMargins = mBottomMargin - mTopMargin;
final int linesToScroll = Math.min(linesBetweenTopAndBottomMargins, linesToScrollArg);
mScreen.blockCopy(0, mTopMargin, mColumns, linesBetweenTopAndBottomMargins - linesToScroll, 0, mTopMargin + linesToScroll);
blockClear(0, mTopMargin, mColumns, linesToScroll);
mScreen.blockCopy(mLeftMargin, mTopMargin, mRightMargin - mLeftMargin, linesBetweenTopAndBottomMargins - linesToScroll, mLeftMargin, mTopMargin + linesToScroll);
blockClear(mLeftMargin, mTopMargin, mRightMargin - mLeftMargin, linesToScroll);
} else {
// "${CSI}${func};${startx};${starty};${firstrow};${lastrow}T" - initiate highlight mouse tracking.
unimplementedSequence(b);

10
terminal-emulator/src/test/java/com/termux/terminal/ScrollRegionTest.java
View File

@@ -75,6 +75,16 @@ public class ScrollRegionTest extends TerminalTestCase {
withTerminalSized(3, 3).enterString("\033[?69h\033[2sABC\033[?6h\033ED").assertLinesAre("ABC", " D ", " ");
}
public void testRiRespectsLeftMargin() {
// Reverse Index (RI), ${ESC}M, should respect horizontal margins:
withTerminalSized(4, 3).enterString("ABCD\033[?69h\033[2;3s\033[?6h\033M").assertLinesAre("A D", " BC ", " ");
}
public void testSdRespectsLeftMargin() {
// Scroll Down (SD), ${CSI}${N}T, should respect horizontal margins:
withTerminalSized(4, 3).enterString("ABCD\033[?69h\033[2;3s\033[?6h\033[2T").assertLinesAre("A D", " ", " BC ");
}
public void testBackwardIndex() {
// vttest "Menu 11.3.2: VT420 Cursor-Movement Test", test 7.
// Without margins: