[tor-commits] [Git][tpo/applications/mullvad-browser][mullvad-browser-115.9.0esr-13.5-1] fixup! Bug 41631: Prevent weird initial window dimensions caused by subpixel computations

richard pushed to branch mullvad-browser-115.9.0esr-13.5-1 at The Tor Project / Applications / Mullvad Browser

Commits:

76baafb8

by hackademix at 2024-04-08T19:52:12+00:00

fixup! Bug 41631: Prevent weird initial window dimensions caused by subpixel computations

Bug 42192: Correctly round new windows when bookmarks toolbar is set to "Only Show on New Tab"

1 changed file:

toolkit/components/resistfingerprinting/RFPHelper.sys.mjs

Changes:

toolkit/components/resistfingerprinting/RFPHelper.sys.mjs

@@ -537,27 +537,17 @@ class _RFPHelper {
        ])
      );
 -    if (
 -      !win._rfpSizeOffset ||
 -      (win._rfpOriginalSize &&
 -        win.outerWidth === win._rfpOriginalSize.width &&
 -        win.outerHeight === win._rfpOriginalSize.height)
 -    ) {
 -      const BASELINE_ROUNDING = 10;
 -      const offset = s =>
 -        s - Math.round(s / BASELINE_ROUNDING) * BASELINE_ROUNDING;
 +    const isInitialSize =
 +      win._rfpOriginalSize &&
 +      win.outerWidth === win._rfpOriginalSize.width &&
 +      win.outerHeight === win._rfpOriginalSize.height;
++
 +    // We may need to shrink this window to rounded size if the browser container
 +    // area is taller than the original, meaning extra chrome (like the optional
 +    // "Only Show on New Tab" bookmarks toobar) was present and now gone.
 +    const needToShrink =
 +      isInitialSize && containerHeight > win._rfpOriginalSize.containerHeight;
 -      win._rfpSizeOffset = {
 -        width: offset(parentWidth),
 -        height: offset(parentHeight),
 -      };
 -      log(
 -        `${logPrefix} Window size offsets %o (from %s, %s)`,
 -        win._rfpSizeOffset,
 -        parentWidth,
 -        parentHeight
 -      );
 -    }
      log(
        `${logPrefix} contentWidth=${contentWidth} contentHeight=${contentHeight} parentWidth=${parentWidth} parentHeight=${parentHeight} containerWidth=${containerWidth} containerHeight=${containerHeight}${
          isNewTab ? " (new tab)." : "."
@@ -573,33 +563,27 @@ class _RFPHelper {
      const roundDimensions = (aWidth, aHeight) => {
        const r = (width, height) => {
 -        lastRoundedSize = {width, height};
 +        lastRoundedSize = { width, height };
 +        log(
 +          `${logPrefix} roundDimensions(${aWidth}, ${aHeight}) = ${width} x ${height}`
 +        );
          return {
            "--letterboxing-width": `var(--rdm-width, ${width}px)`,
            "--letterboxing-height": `var(--rdm-height, ${height}px)`,
 -        }
 +        };
        };
 -      let result;
 +      log(`${logPrefix} roundDimensions(${aWidth}, ${aHeight})`);
 -      if (!this.letterboxingEnabled) {
 -        const offset = win._rfpSizeOffset;
 -        result = r(aWidth - offset.width, aHeight - offset.height);
 -        log(
 -          `${logPrefix} Letterboxing disabled, applying baseline rounding offsets: (${aWidth}, ${aHeight}) => ${result.width} x ${result.height})`
 -        );
 -        return result;
 +      if (!(isInitialSize || this.letterboxingEnabled)) {
 +        // just round size to int
 +        return r(aWidth, aHeight);
+       }
 -      log(`${logPrefix} roundDimensions(${aWidth}, ${aHeight})`);
        // If the set is empty, we will round the content with the default
        // stepping size.
        if (!this._letterboxingDimensions.length) {
 -        result = r(this.steppedSize(aWidth, true), this.steppedSize(aHeight));
 -        log(
 -          `${logPrefix} roundDimensions(${aWidth}, ${aHeight}) = ${result.width} x ${result.height}`
 -        );
 -        return result;
 +        return r(this.steppedSize(aWidth, true), this.steppedSize(aHeight));
+       }
        let matchingArea = aWidth * aHeight;
@@ -625,14 +609,9 @@ class _RFPHelper {
        // If we cannot find any dimensions match to the real content window, this
        // means the content area is smaller the smallest size in the set. In this
        // case, we won't round the size and default to the max.
 -      result = targetDimensions
 +      return targetDimensions
          ? r(targetDimensions.width, targetDimensions.height)
          : r(aWidth, aHeight);
+-
 -      log(
 -        `${logPrefix} roundDimensions(${aWidth}, ${aHeight}) = ${result.width} x ${result.height}`
 -      );
 -      return result;
      };
      const styleChanges = Object.assign([], {
@@ -654,6 +633,10 @@ class _RFPHelper {
                lazy.logConsole.error(e);
+             }
+           }
 +          if (needToShrink) {
 +            win.shrinkToLetterbox();
 +            this._recordWindowSize(win);
 +          }
          });
        },
      });
@@ -741,15 +724,20 @@ class _RFPHelper {
      aWindow.setTimeout(() => {
        tabBrowser.tabpanels?.classList.add("letterboxing-ready");
        if (!aWindow._rfpOriginalSize) {
 -        aWindow._rfpOriginalSize = {
 -          width: aWindow.outerWidth,
 -          height: aWindow.outerHeight,
 -        };
 -        log("Recording original window size", aWindow._rfpOriginalSize);
 +        this._recordWindowSize(aWindow);
+       }
      });
+   }
 +  _recordWindowSize(aWindow) {
 +    aWindow._rfpOriginalSize = {
 +      width: aWindow.outerWidth,
 +      height: aWindow.outerHeight,
 +      containerHeight: aWindow.gBrowser.getBrowserContainer()?.clientHeight,
 +    };
 +    log("Recording original window size", aWindow._rfpOriginalSize);
 +  }
++
    // We will attach this method to each browser window. When called
    // it will instantly resize the window to exactly fit the selected
    // (possibly letterboxed) browser.