Ensure that the `baseTransform` is applied when rendering annotations

Fixes 3350.
Fixes 5946.
Fixes 6334.
Fixes 6722.
Probably fixes 3826 (since the PDF files are no longer available, I cannot confirm it).

src/display/canvas.js

@@ -1839,6 +1839,10 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
     beginAnnotations: function CanvasGraphics_beginAnnotations() {
       this.save();
       this.current = new CanvasExtraState();
+
+      if (this.baseTransform) {
+        this.ctx.setTransform.apply(this.ctx, this.baseTransform);
+      }
     },
 
     endAnnotations: function CanvasGraphics_endAnnotations() {

test/pdfs/.gitignore

@@ -11,6 +11,7 @@
 !issue2391-2.pdf
 !issue4665.pdf
 !issue5801.pdf
+!issue5946.pdf
 !issue5972.pdf
 !issue5874.pdf
 !filled-background.pdf

test/test_manifest.json

@@ -637,6 +637,13 @@
        "link": false,
        "type": "eq"
     },
+    {  "id": "issue5946",
+       "file": "pdfs/issue5946.pdf",
+       "md5": "1217a3c8e2ee4ceb96d85a2f27e437b4",
+       "rounds": 1,
+       "link": false,
+       "type": "eq"
+    },
     {  "id": "issue5954",
        "file": "pdfs/issue5954.pdf",
        "md5": "4f60ec0d9bbeec845b681242b8982361",