Fix: Status bar hides text with minimal bottom margin (#5135)

With very narrow bottom margin text is sometimes hidden by status bar.

frontend/apps/reader/modules/readerfooter.lua

@@ -295,7 +295,11 @@ function ReaderFooter:resetLayout()
 end
 
 function ReaderFooter:getHeight()
-    return self.footer_content:getSize().h
+    if self.footer_content then
+        return self.footer_content:getSize().h
+    else
+        return 0
+    end
 end
 
 function ReaderFooter:disableFooter()

frontend/apps/reader/modules/readertypeset.lua

@@ -506,7 +506,7 @@ function ReaderTypeset:onSetPageMargins(margins, refresh_callback)
     if self.view.footer.has_no_mode or self.view.footer.reclaim_height then
         bottom = Screen:scaleBySize(margins[4])
     else
-        bottom = Screen:scaleBySize(margins[4] + DMINIBAR_HEIGHT)
+        bottom = Screen:scaleBySize(margins[4]) + self.view.footer:getHeight()
     end
     self.ui.document:setPageMargins(left, top, right, bottom)
     self.ui:handleEvent(Event:new("UpdatePos"))

spec/unit/readerfooter_spec.lua

@@ -296,8 +296,8 @@ describe("Readerfooter module", function()
         assert.are.same(365, footer.text_width)
 
         footer:onPageUpdate(100)
-        assert.are.same(191, footer.progress_bar.width)
-        assert.are.same(389, footer.text_width)
+        assert.are.same(183, footer.progress_bar.width)
+        assert.are.same(397, footer.text_width)
     end)
 
     it("should support chapter markers", function()

spec/unit/readerrolling_spec.lua

@@ -186,13 +186,13 @@ describe("Readerrolling module", function()
         it("should show pages for different word gap", function()
             readerui.document:setSpaceCondensing(100)
             readerui:handleEvent(Event:new("ChangeScreenMode", "portrait"))
-            assert.are.same(248, readerui.document:getPageCount())
+            assert.are.same(251, readerui.document:getPageCount())
             readerui.document:setSpaceCondensing(75)
             readerui:handleEvent(Event:new("ChangeScreenMode", "portrait"))
-            assert.are.same(241, readerui.document:getPageCount())
+            assert.are.same(242, readerui.document:getPageCount())
             readerui.document:setSpaceCondensing(50)
             readerui:handleEvent(Event:new("ChangeScreenMode", "portrait"))
-            assert.are.same(231, readerui.document:getPageCount())
+            assert.are.same(233, readerui.document:getPageCount())
         end)
     end)