r - Descenders in facet panel intrude on panel background -

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i have plot on white background grey facets , white facet text:

ggplot(data = data.frame(x = rep(1:2, 2), y = rep(1:2,2), color = c("ap", "ap", "b", "b")),         aes(x = x, y = y, color = color)) +    geom_point() +    facet_grid(~color) +    theme(panel.background = element_blank(),          strip.text = element_text(color = "white", size = 23))

enter image description here

my problem descenders (p, g, q, j) cross facet. strip background have margin around text glyphs in facet text strictly within facet rectangle. can add newlines facet text color = c("ap\n", "ap\n", "b\n", "b\n") margin excessive (or lineheight required ugly). there ggplot2 solution this?

for ggplot v2.2.0 in theme, specify margins in strip_text element (see here)

# set text size size = 26  library(ggplot2) library(grid)  p = ggplot(data = data.frame(x = rep(1:2, 2), y = rep(1:2,2), color = c("ap", "ap", "b", "b")),        aes(x = x, y = y, color = color)) +        geom_point() +        facet_grid(~color) + theme_bw() +       theme(strip.text = element_text(color = "white", size = size))      p +   theme(strip.text.x = element_text(margin = margin(.1, 0, .3, 0, "cm")))

original use ggplot layout adjust height of strip. height set absolute height, instance, unit(1, "cm"), or, i've done here, set height adjusts font size.

edit: updating ggplot2 2.0.0
further edit: updating grid 3.0.0 grid:::unit.list() no longer needed. 

# set text size size = 26  library(ggplot2) library(grid)  p = ggplot(data = data.frame(x = rep(1:2, 2), y = rep(1:2,2), color = c("ap", "ap", "b", "b")),        aes(x = x, y = y, color = color)) +        geom_point() +        facet_grid(~color) + theme_bw() +       theme(strip.text = element_text(color = "white", size = size))    # ggplot grob g <- ggplotgrob(p)  # set relevant height g$heights[3] = unit(2, "grobheight", textgrob("a", gp=gpar(fontsize = size)))    grid.newpage() grid.draw(g)

enter image description here


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